Add a check that FreeIPA is actually up after upgrade
    
    The FreeIPA upgrade test didn't actually check that FreeIPA is
    actually running after the upgrade and reboot, it just kinda
    assumed it is. Let's add a check to the start of the 'check'
    test module that makes sure ipa.service actually comes up to
    'active' state. This'll make it clearer when tests are failing
    because FreeIPA didn't come up right after the upgrade. The
    check will run on non-upgrade tests too, but that's fine.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>